Troubleshoot A Blank Local Operator Interface (Loi) Display Screen - Emerson Rosemount 700XA Reference Manual

Reference Manual
2-3-9000-744
A.5 Troubleshoot a blank local operator interface
(LOI) display screen
If the LOI is powered up but the LCD display screen is blank, do the following:
Procedure
1. Power down the gas chromatograph and allow to cool before opening the upper
2. Unscrew and remove the LOI board.
3. Flip the LOI over to expose its motherboard and associated electronics. Make sure
4. Check the jumpers located at J105 on the motherboard. These jumpers control the
If the screen is still blank, replace the board.
Rosemount 700XA
enclosure door.
the J12 connector is tightly connected to the motherboard via ribbon cable.
Figure A-77: Jumpers at J105 on LOI motherboard
screen's power. To function properly, jumper pins 3 and 4 must be set; if they are
not, set them.
Local operator interface (LOI)
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